Turbine bleeder valve



May 19, 1925. 1,538,255

' J. MOORE TURBINE BLEEDER VALVE Filed March 1.6, 1922 2 Sheets-Sheet 1J. L. MOORE TURBINE BLEEDER-VALVE Filed March 16, 1922 May 19, 1925.

MpvE-ss Patented May 19, .1925.

UNITED "STATES PATENT V OFFICE.

JAMES LEONARD MOORE, OF WELLSVILLE, NEW" YORK, ASSIGNOB TO THE MOORE'srrEAMTUn-BINE CORPORATION, or 'WLELLSVI LE, NEW Yonrz, A GGH-PORATIONor new YORK.

cruiininn'istsnnne VALVE.

Application filed March 16, 1922 Serial No. 544,148.

To all whom it may concern:

Be it known that I, JAMES LEONARD Moons, a citizen of theUnited States,residing at ellsvillain the county of Allegany and State of New York,have invented certain new and useful Improvements in Turbine BleederValves. of which the following is a full and clear description thereof.

This invention relates to bleeder valves'as applied to turbines, andmore'particularly' designed and adapted for use in connection with highpressure condensing steam turbines. V

The objects of the invention are First, to construct and arrange asteam;

valve under all conditions of service which the turbine i'nigl'it besubjected to.

Second, to construct a bleeder valve'par ticularly adapted for use inconnection with a steam turbine, which will not stick or rust in theturbine easing while remaining in one position during; the summer monthswhen steam is not being bled or used in the heating or other auxiliarysystems, and hence avoid.

a common and troublesome defect-in bleeder valves now in common use inwhich no clearance is provided between the valve and rates two stagesofexpansion of the multistage turbine, said chamber 14 in the inthe boredsection of the turbine casing.

Third, to construct a bleeder valve for use in connection with highpressure con- (lensing; lurl'iines havinga small clearance lutweeuil1eoutside dian'ieters oi" the valve and the turbine casing; bored toreceive said valve, so that said valve in its closed position is notabsolutely steanrtight, whereby a small volume of steam is capable atall times to pass through the linal stages of the tru'bineto thecondenser for the purpose of preventing said final stages from becomingoverheated.

Fourth, to construct the shape of the bleeder valve and arrange orlocate the same in the turbine'casing, so that a large and unrestrictedarea or outlet for the passage of the steam from the first to finalstages can be provided for or eli'ected, thereby insuring a minimum dropinsteam pressure between said stages and, providing a high efficiency ofoperation during the summer months when no steam is bled from theturbine.

Other objects and advantages of the invention will appear from thedetaileddisclosure of the construction and arrangement of elements andmode of operationto be presently described. The invention consists ofstructural characteristics and relative arrangements of elements whichwill be hereinafter more fully described and particularly pointed out inthe appended claims.

In the two sheets of drawings, in which similar reference charactersindicate the same parts in the several figures:

Figure 1 is a longitudinal vertical section ot'a portion of a turbineprovided with the improved hleeder valve, and taken on the line II ofFigure 2.

Figure is a transverse vertical section, taken on line-IIII of Figure 1,and Figure 3 is a fragmentary sectional view, taken on line III-III ofFigure the valve is open- In the drawings, 10 is the turbine casingwhich is provided with alive steam or high pressure inlet 11 and a lowpressure outlet 12. Within the turbine casing 10 and interposed betweenthe said live steam or high pressureinlet 11 and the low pressure outlet12 is provided a diaphragm 13., which sepastance illustrated in thedrawing being the first or high pressurestap e, while chamber 2, whenbers 1S and if) being [ixed to a rotary shaft 20 supported in suitablefluid-tight bearings 21 within the front and rear heads of the casing 10as is connnon in this class of engines and forms no part of the presentinvention.

The casing 10 or cylinder of the turbine at the section correspondingpreferably at the upper edge of the diaphragm 13 is so formed andconstructed as to provide an opening or passageway 22 which forms acommunication between the first or high pressure stage chamber 144. andthe second or lower pressure stage 15. The cylinder or casing 10 and theupper edge of the di aphragm 13 are bored transversely to thelongitudinal axis of the turbine in such a manner as to form jointly acircular valve seat 23 in which is disposed or arranged the blee dervalve 24. Said bleeder valve 2st is supported and carried by two stubvalve stems or spindles and 26, which stems rest in bearings 2T. 27, asshown, on either side of the turbine casing 10, and said valve stems and26 are so proportioned with respect to their bearings and ar'anged withregard to the body of the blceder valve 2 l that said stems or spindles25 and 26 carry the full weight 0t said valve 2% and the clearance ofthe stems 24' and 2G in their bearings is such that said valve 24; maybe easily turned by a governor, not shown, and illustrated for examplein U. S. Patent No. 801,322 to Kerr dated October 10, 1905, which may beattached or linked to a lover or arm 28 on the outer end of the stem 26.as indicated in Figure 2. and common in this class of inventions andneeds no further disclosure.

The main body of said bleeder valve 2-lis formed with a dian'ietricalpartition 29 and a connected circular section 30, so construeted' andarranged that when the valve 2 1- is turned into the position shown inFigure 3, the two chambers la and 15 on the opposite. sides 01"? thediaphragm 13 are in comn'iunication with each other through thepassageway or opening 22, permitting the high expanded steam to passfrom the first stage to the succeeding stages oi expansion and to thetin-a1 exhaust opening and thence to the condenser, not shown.

The main body of the valve 2% of such a diameter that adegree ofclearance pro-.

vided between the main body of the valve 2t and its outer seat 23. sothat said valve 2t does not rest on its seat but is supported. aspreviously described, entirely by the stems or spindles 25 and 26 andwill accordingly permit a small clearance. or restricted pas sageway 31to be formed at the upper edge of the diaphragm 13, as indicated inFigure 1, through which a slight leakage 0t steam from the chamber it tochamber 15 can take place when the blceder valve 21- is closed, as shownin Figure 1. This arrangement and construction of valve 2%. with respectto its seat will not only enable a small quantity of steam to pass atall times through the. final stages of the turbine to the condenser whenthe valve 2- is closed. and thereby preventing these iinal stages frombecoming overheated as when running.

dry or without expanded steam as in prior turbines provided with bleedervalves, but at the same time insures the easy turning and operation ofthe valve at all times and eliminates all danger or the bleeder valve 2%sticking or rusting to its seat during the summer months when thebleeder valve is open, as shown in Figure 3 and no expanded steam isused in connection with the heating system, or for other auxiliary useor apparatus of the plant.

It will also be seen by the shape and configuration oi? the valve 21!;and its arrangement with respect to the diaphragm 1?) and casing 10, alarge undivided or unrestrictial. cross-sectional area or apertureforming passageway or opening can be opened up between the two chambers14 and 15. thereby etl'ccting a minimum reduction in pressure of thesteam in passing from chambers ll to 15 and hence greatly increase thecilicieney of the turbine during the six or seven months when no steamis being bled.

From the foregoing description of the construction and arrangen'ient ofparts, mode of assembling the same and their operation, it will be seenthat all the objects and advantages recited in the statement ofinvention have been tullv. elliciently and cheaply car ried out, andwhile the preferred torm has been shown and described, it is to beunderstood that many changes will suggest themselves without in anywavvarying the essential features of construction or departing from thespirit of the invention as expressed in the claims.

that I claim is l. A n'iulti-stage expansion steam turbineCOlllpl'lSlllg a -a:-;ing having a live steam or high pressure inlet andtmal low pressure outlet, means for eli ecting a plurality of stages ofexpansion within said casing and interposed between said inlet andoutlet. a diaphragm within the casing separatin one stage 0t expansionfrom a succeeding stage of expansion and provided with an opening forthe passage oi the steam from one stage to the adjacent succeeding stageof e.- pansion, an intern'iediatc steam pressure out let connnunicatingwith a stage ahead ot the diaphragm and receiving expanded s cam andexterior of the casing, a rotary cylindrical bleeder valve disposed insaid opening and solely supported at its ends and having ports. arrangedand adapted to conlit! trol the passage of the expanded steam throughsaid opening from one stage to a succeeding stage or into theintermediate fluid pressure outlet, said bleeder valve provided with aclearance between its-seat and valve body whereby said valve willnot'rust or stick to its seat or turbine casing and also permit a smallvolume of expanded steam to constantly pass through said clearance tothe other stages of expansion between said diaphragmand final lowpressure outlet when said bleeder valve is in its closed position. p

2. A multi-stage expansion steam turbine comprising a casing having ahigh pressure inlet and final low pressure outlet, means for effecting aplurality of stages of expansion within said casing and interposedbetween said inlet and outlet, a diaphragm within the casing separatingone stage of expansion from a succeeding stage of expansion and providedwith a bleeder valve seat and an opening for the passage of the steam,from one stage to the adjacent succeeding stage of expansion, anintermediate steam pressure outlet communicating with a stage ahead of.the diaphragm and receiving expanded steam and exterior of the casin arotary cylindrical bleeder valve disposed in said opening and supportedsolely at its ends and within said seat and having ports, arranged andadapted to control the passage of the expanded steam through saidopening from one stage to a succeeding stage or into the intermediatefluid pressure outlet, said bleeder valve provided with a clearancebetween its cylindricalseat and valve body. whereby said valve willeasilv rotate and not rust or stick to its seat or turbine casing aneethe other stages of expansion between sz-riddiaphragm and final lowressure outletwhen said bleeder valve is in its closed position.

3. A inulti-stage expansion steam turbine con'iprising a casing having alive steam or high pressure inlet and final low pressure outlet, meansfor effecting a plurality of stages of expansion within said casing andinterposed betweensaid inlet and outlet a diaphragm within the casingseparating one stage of expansion from, a succeeding stage of expansionand provided with an opening for they passage of the steam from onestage to the adjacent succeeding stage. of expan sion, a cylindricalbleeder valve seat in the casing adjacent to said diaphragm, an intermediate steam pressure outlet communicating with a stage ahead of thediaphragm and receiving expanded steam and exterior of the casing, arotary cylindrical bleeder valve solely supported at its ends and having'2 ports, arranged and adapted to control the passage of the expandedsteamthrough said and also permit a small volume of expanded steam toconstantly pass through said clearopening from one stage to a succeedingstage or into the intermediate fluid pressure out; let,'said bleedervalve provided with a cylindrical clearance extending the full length ofthe valve between said valve seat and valve body, whereby said valvewill easily oscillate and notrust or stick to its seat or turbine casingand also permit a small outlet, means for effecting a plurality ofstages of expansion within said casing and interposed between said inletand outlet, a diaphragm within the casing separating one stage ofexpansion from a succeeding stage of expansion and provided with anunrestricted opening for the passage of the steam from one stage to theadjacent succeeding stage of expansion, an intermediate steam pressureoutlet communicating with a stage ahead of the diaphragm and receivingexpanded steam and exterior of the easing, a rotary cylindrical bleedervalve solely supported at itsends and provided with ports. arranged andadapted to unobstructedly control the passage of the expandedste'amthrough said opening from one stage to a succeeding stage orintothe intermediate fluid pressure outlet, said bleeder valve providedwith a clearance between its seat and body. whereby said valve willeasily oscillate and not rust or stick toits seat or turbine casing andalso permit a small volume of expanded steam to constantly pass throughsaid clearance to the other stages of expansion between said diaphragmand final low pressure outlet when said bleeder valve is in its closedposition.

5. A multi-stage expansion steam turbine comprising a casing havingalive steam or high pressure inlet and final low pressure outlet, meansfor effecting a plurality of stages of expansion within said casing andinterposed between said inlet and outlet, a diaphragn'i within thecasing separating one stageot' expansion from a succeeding stage ofexpansion and'provided with an opening for the passage of the stean'ifrom one stage to the adjacent succeeding stage of expan sion, atbleeder valve seat in the casing. an intermediate steam pressure outletcom municating with a stage ahead of the diaphragm and receivingexpanded steam and exterior of the casing, a rotary cylindrical bleedervalve having a diametrical partition and a connected circular sectionforming ports. arranged and adapted to control the passage of theexpanded steam through said opening from one stage to a succeeding ill)ion

stage or into the intermediate fluid pressure outlet, said bleeder valvesupported solely at its ends and unobstructedly of its seat and providedwith a clearance between the seat and valve body whereby said valve willeasily rotate and not rust; or stick to its seat or turbine casing andalso permit a small volume of expended steum to emietuntly pass throughthe other stages of expunsion between said diaphragm and final low pres-10 sure outlet when said bleeder valve is in its closed position.

In testimom whereof I nfiix my signature.

JAMES LEONARD MOORE.

